2 * This module derived from code donated to the FreeBSD Project by
3 * Matthew Dillon <dillon@backplane.com>
5 * Copyright (c) 1998 The FreeBSD Project
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
34 * MALLOC.C - malloc equivalent, runs on top of zalloc and uses sbrk
37 #include "zalloc_defs.h"
39 static MemPool MallocPool;
43 static int MallocCount;
45 void mallocstats(void);
53 static void *Malloc_align(size_t, size_t);
56 Malloc(size_t bytes, const char *file __unused, int line __unused)
58 return (Malloc_align(bytes, 1));
62 Memalign(size_t alignment, size_t bytes, const char *file __unused,
68 return (Malloc_align(bytes, alignment));
72 Malloc_align(size_t bytes, size_t alignment)
77 bytes += MALLOCALIGN + 1;
82 while ((res = znalloc(&MallocPool, bytes, alignment)) == NULL) {
83 int incr = (bytes + BLKEXTENDMASK) & ~BLKEXTENDMASK;
86 if ((base = sbrk(incr)) == (char *)-1)
88 zextendPool(&MallocPool, base, incr);
89 zfree(&MallocPool, base, incr);
92 if (++MallocCount > MallocMax)
93 MallocMax = MallocCount;
96 res->ga_Magic = GAMAGIC;
98 res->ga_Bytes = bytes;
100 *((signed char *)res + bytes - 1) = -2;
103 return ((char *)res + MALLOCALIGN);
107 Free(void *ptr, const char *file, int line)
112 Guard *res = (void *)((char *)ptr - MALLOCALIGN);
117 if (res->ga_Magic == GAFREE) {
118 printf("free: duplicate free @ %p from %s:%d\n",
122 if (res->ga_Magic != GAMAGIC)
123 panic("free: guard1 fail @ %p from %s:%d",
125 res->ga_Magic = GAFREE;
128 if (*((signed char *)res + res->ga_Bytes - 1) == -1) {
129 printf("free: duplicate2 free @ %p from %s:%d\n",
133 if (*((signed char *)res + res->ga_Bytes - 1) != -2)
134 panic("free: guard2 fail @ %p + %zu from %s:%d",
135 ptr, res->ga_Bytes - MALLOCALIGN, file, line);
136 *((signed char *)res + res->ga_Bytes - 1) = -1;
139 bytes = res->ga_Bytes;
140 zfree(&MallocPool, res, bytes);
149 Calloc(size_t n1, size_t n2, const char *file, int line)
151 uintptr_t bytes = (uintptr_t)n1 * (uintptr_t)n2;
154 if ((res = Malloc(bytes, file, line)) != NULL) {
157 if (++MallocCount > MallocMax)
158 MallocMax = MallocCount;
165 * realloc() - I could be fancier here and free the old buffer before
166 * allocating the new one (saving potential fragmentation
167 * and potential buffer copies). But I don't bother.
171 Realloc(void *ptr, size_t size, const char *file, int line)
176 if ((res = Malloc(size, file, line)) != NULL) {
178 Guard *g = (Guard *)((char *)ptr - MALLOCALIGN);
180 old = g->ga_Bytes - MALLOCALIGN;
182 bcopy(ptr, res, old);
184 bcopy(ptr, res, size);
185 Free(ptr, file, line);
188 if (++MallocCount > MallocMax)
189 MallocMax = MallocCount;
191 if (DidAtExit == 0) {
203 Reallocf(void *ptr, size_t size, const char *file, int line)
207 if ((res = Realloc(ptr, size, file, line)) == NULL)
208 Free(ptr, file, line);
217 printf("Active Allocations: %d/%d\n", MallocCount, MallocMax);
219 zallocstats(&MallocPool);